/Engine/Source/Runtime/Interchange/Core/Public/Nodes/InterchangeUserDefinedAttribute.h
Create user defined attribute with a value and a optional payload key param UserDefinedAttributeName - The name of the user defined attribute param Value - The value of the user defined attribute param PayloadKey - The translator payload key to retrieve theFRichCurveanimation for this user defined attribute note - User defined attributes are the DCC translated node user custom attributes (i.e. Maya extra attributes) Payload key will point on aFRichCurvepayload.
template<typename ValueType> static bool CreateUserDefinedAttribute ( [UInterchangeBaseNode](API\Runtime\InterchangeCore\Nodes\UInterchangeBaseNode) * InterchangeNode, const [FString](API\Runtime\Core\Containers\FString) & UserDefinedAttributeName, const ValueType & Value, const [TOptional](API\Runtime\Core\IO\TOptional)< [FString](API\Runtime\Core\Containers\FString) > & PayloadKey )